Balancing machine



Nv. 10,`l925- 1,561,177

J. LUNDGREN BALANCING MACHINE Filed June 4, 1913- 3 Sheets-Sheet 2 IN VEN TOR.

gran,

A TTORNE Y.

Jac'l? und Nov. 10, 1925.` l -J UNITED .STATE PA'rl:1-x*'r r OFFICE.

JACOB` LUNDGREN, l'or .1 nILAnnarrna,'rEimer/rimarray asspIGNoR lro CARLSON- wnNsrnom Co., A CORPORATION or DELAWARE.

BALANTCING :MACHINE Application atea :une 4,

To all whom 'it may cor-wem.'

Be it'lrnotvnthat I, JACOB LUNDCREN, ai,

citizen of the United States,l residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Balancing Machines, of which the "following is a speciiication.l t

The dbjectf this invention is to pro-vide an improved balancing machine, especially esigned to indicate the absence ofstatic balance in 'a rotatable body, and aswell the degree of static balance thereof, while said body isrotating. c It has lon been the custom to determine this type of alance,"within certain very restricted ranges of accuracy,l by means of level parallel edges, upon which the rotatable body is carefully laid, either directly, or by'means of a' supporting shaft. 'With this arrangement the bodybeing tested Ahas a tendency to roll, untilwits heavier side assumes the lowermost possible position. I i

However, it is obvious fromwell-known physical laws, that there is a certain amount of unavoidable friction that cannot be eliminated from between .the parallel edgesl 'and the'surface contacting therewith, and as a result of this inevitable hindrance, even the one lowermost position, thus making when decreased to the greatest' possible'extent, the heaviest side of the body being tested will not in every case infallibly stop at such a test liable to too great a'degree of inaccuracy where a maximum degree ofy static,

balance is` required.

. especially those desi Obviously,.some types of rotatable bodies, edto revolve at how i speeds, and of relatively light weight, can

for all intents and purposes be balanced -upon the so-called paral1e1s and the al# most certain existence of residual'unbalan'ce will not operate harmfull orwith`deteriorating effect, upon the earings, foundations, and. other elements in conjunction with which the body is designed to beL run in actual or commercial practice.

However, on the other hand; there are bodies which, though relatlvely light in weight, are designed to revolve at high 'speeds, and there are bodies which, though desi ed to runat but low speeds, are rela- I -tive y heavy, both of. which types `must be balancedA statically with absolute accuracy in order to insure the-apparatus of which 191s.` serial No. asslass.'

they are designed to for-1n a lpart attaining the greatest possible efficiency- Of the rst class there arefthe lighter armaturesor rotors of electrical machinery, bowls of cream separators, crank shafts of automobiles and other forms of internal lcombustion engines, and the like, while of the latter class .there are the large rotors of steam turbines, rotors is capable of balancing statlcally to angin-V nite degree Of accuracy/.A In the 'first place, 'instead of endeavoring to balance the body by gravity with the inevitable inaccuracy of.` such method, this invention transforms the disturbing cause ofunbalance into a centrif-4 ugal force by lrevolving the body while be ing tested. Then it greatly magnifies this rforce byfincreasing the speed of revolution,

thus making a Arelatively slight cause offunbalance of great magnitude and thereby readily visible in its vibrationicausing e v feet, said effect as a result'becoming extremely tangible and capable of analysis, minute dissection, and completeelimination.

Furthermore, the testing l ofl the body whose balance is desired/is carried out by revolving the` same upon an bscllatory "mounting, which is so supported as to confine all of the vibrationsn one direction and as affecting fone element of the mechanism, in addition to giving the vn'ation-causing eect free reign by thefju icious employ-' i Iment of `spring and hinge supports, thus eliminating all .damping or counteractm Sof the useful positively mdicating 'vibrations by secondary and induced vibrations of and within other elementary parts of the balanc' ing mechanism as a whole.

The revolving of the body being tested is done in absolute sy,nchronism"`with a pair of weights, whichI are so shifted 'circumfer entially with respect to. eaclr other` as to create a variable centrifugal force, operative to exactly counteract the centrifugal force set up by the unbalancing weight upon or within said body, and thus to positively damp all vibration of vthe 4said oscillatory mounting. Y

A"Provision is also made for shifting the balancing weights axially with respect to the body being testedfwhile all are rota 'at any desired speed. (Also, the said deihts are preferably moved longitudinally vof their, common axis of rotation as the approach, or are separated from, each o er circumferentially, and are in their effect the equivalent of/asingle fixed weight movable radially n offits axis of rotation, to VvLary the centrifugal force set up by it when revolving; Finally, by vsuitable direct reading devices, the exact location or position and extent of theJcause of unbalance, as indicated by the positions of said weights with respect to each other, and jointlywith respect to the body being tested, are positively and accurately determined, and v said -unbalance is vthen most 'easily corrected for byeither removing material from, or adding the equivalent thereof to, a definite 'part or parts of the said body. g Y

The operation of this invention comprises the revolvable association of an unbalanced body with the equivalent, as stated, or a radially adjustable weight mounted togrevolve upon an axis either parallel, or coincident with, that of the said body, revolving said bodyand weight ini absolute ysynchronism, so that any unbalance on`the part of the body will oscillate'the mounting therefore, and then adjustiugradially the eeetive balancing weight2 aswell as altering -its angular relation with respect to that of the body being tested, while both are reyolving continuously. 5

The further details of construction and operation of the invention in its preferred embodiment are ,fully and clearly brought out in the following description when rea in 1conjunction with the accompanying drawings in which, Fig. 1 is a front elevation of the completeunac'hine embodying5 the Ypreferred form of the invention; Fig. 2 is an enlarged detail elevation of the head-stock and vijdedwhich preferably comprises a pair of balancing mechanism; Fig. 3 is a vertical transverse section on the line 3 -3 of Fig. 2; and Fig. 4 is a similar section dn the line 1 -4 of Fig. 2.

e. Referring to the drawingsha base is prospaced upright members 1, which may be securedto '"a Hoor or otherfoundation in any sultable manner, and areA maintained with 'bsoluteri'gidity with respect tov each other` by means of a pair of horizontal, longitudinally extending bars or rods 2, one., connectrear portions of said base members, and being ad]ustably et firmly secured to the latter fat their endI portions by kmeans of suitl ablej clamps i 3 f An oscillatory member4 iskpivotably supported upon, `and in spaced relationj with, the uppermost portions vof the base mem- ,bers 1 by means of spacedresilient hinges 5Y at the rearL of the device and imlylsecured/ kann? i vto the members wbichthey connect, while the l A' adjacent forward portions ofthe members L -springs or other resilient means 6.

the hand-wheel, the bracket 10, rod 9, and

the bearings connected thereto, arev capable of being shifted as a unit longitudinally of the said oscillatory member.

Preferably atr the right hand portion of the machine lis prbvided the head-stock 20, l

to which are secured three upwardlyextendbea brackets 21, 22 and 23. The lrt ofrtlhse Vbrackets providesY a bearing throughlwhich is journalled `a shaft 24, carrying upon its outer Aend a face-plate, or other sultable means for revolving a body to be tested,l while the inner end of saidl is vprovided with a worm-gear 26;* meshing directly with a worm 27 carried upon the driving shaft 28 which latter also carries a gear 29 and is supported adjacent to its end portiensvby means of suitable bracketsk 30, 'Secured at their'lowermost portions to tlie head-stock20, the motor or other driving means not being own, said shaft 28 also preferably being'that element of the motor or other suitable mechanism..

d mechamsm direcuynriven by a drivingbeing supported adjacent to its end portions by means of brackets 32 to the head stock 20, said` shaft being provided witha" gear 33, while 4the outermostend of said shaft is providedwith a' hand-wheel 34,. and its innermost portion is rovided W1th screw-threads 35. `A remova le sleeve36 is also carried by and is in cooperative engage- `lnent with the threaded portion of the shaft 31, and is provided with a air of spaced fingers ora yoke 37, which s1 dably engages the side walls of an annular groove 38 1n an elongated worm-wheel 39, which latter is Y p7 vlded Y with"/an 'enlarged bore is,v adiipted to move slidably ln a longitudinal e direction upon the shaft. 40, to which it ,is

Y, relative revolving by means seeuredfa of a well-known of keyand key-way 41, said shaft 40 bemg supported u (on Ythe head-stock 20 by means ofthe orward bracket '32f`and a rearw'arrll posltioned bracket 42, and providedwi a gear 43 which is adapted `to directly and eontinu- L ouslyfengage with and be driven by/them29. f f

" g we ghts 50.

/Meshing with the Worm-wheel 39 is a 'wormear 44 secured: to one end'ot` a shaft' 45, whlch is journalled through the bearing brackets r22 and 23 and is provided withcan enlarged section v46, intov vthe surface 'of whichv is cut a spiral ke eway 47, in lwhich are slidably positioned {eys (invisible) -secured by means of screws 48 within the axial bore of each of the sleeyes 49, which in turn are identical in size, w'eight and shape, and are `provided with radially extending portions l50, comprising balancing weights and with spaced annular flanges 51 between which are slidably positioned spaced lingers 52 of a yokeJ member 53. X

.Said yokes'are secured to and moved longitudinally of pthe shaft b` sleeves 54, which rare provided with axial y positioned i. internally threaded bores 55 in cooperative engagement with the respective rightand left-hand threaded surfaces 56 and'57 of rthe shaft 58, which is rotatably supported by 'means of brackets 59 carried by andY extending forwardly fromv the bearing brackets 22 and 23 respectively, said shaft being also provided centrally with a worm-'gear 60 in constant cooperation-'with 'a Worm-Wheel 61 carried by the shaft 62, which in turn is supported by means of brackets 63,-uplon the uppermost surface iof the head-stock 20, said last-named shaft being provided with a hand-wheel A64 and 'with a gear '65 i The gear 65, carried by the shaft 62, meshes with-a gear 66, which in turn, by means of apinion 67 .and gear 68, indicates the ldirection and extent of movement of the hand-wheel 64 by'means of..a'pointer 69, y carried bythe shaft 70 which -supports the gear 68, said pointer` being adaptd'to re- {10 volve` adjacent to a suitably graduated dial .Y 71,y and thus positively f indicate the positi hs of the weights 50. The extent of vement of the' hand-wheel 34 is indicated b a pointer 72 revolvablyositioned adjacent `to the graduated dial g3, said pointer being-mounted upon a shaft 74, which also Acar-ries a gear 75, lin 4turn'me'shing uwith a inion 76, which is ladapted Jto be revolved al gear 77 meshing w1th the gear 33, and thus indicate the angular or 'circumferential relationship of the body being tested lwith res ect to the mean position ofthe -balancix'lg In the operation of this device, a body to be tested is connected to be revolved4 by the face-plate,25I upon the oscillatory member 4,

- synchronous with the rotation of which also revolve the mweights 50, in close proximity central with respect to the shaft 46. It, as 6.0 aresult of an u balanced condition ofthe body being test the said member 4 vi- J ibrates, an endeavor is made to completely counteract the rcause of such'f-unbalance by operating -the hand-v vheel 64 and thereby 15 reciprocatingthe members 49 and partially rotating the weights 50 as hereinbefore de-` scribed. l

If the resultingcounteracting Weight cre-` I ated by the relative movement of the Weights 50 does not entirely eliminate all vibration 70 of the oscillatory member, the angular relay tion of said Weights is altered with respect;y to the body being tested upon. their common axis of rotation by actuating the handwheel 34 and mechanism connected thereto 75 also as hereinbefore described. Thus, a correlation of the positions of the balancing Weights, and a relation of them as a unit axially with respect to the body'being tested,

will be f ound at whichthe cause of unbal`80 ance of the said body becomes completely `neutralized and all vibration of the oscillatory member ceases. y v

Havingv thus -`described my invention, frwhat I claim and desire to protect by Let-` 35- ters Patent is: l o l. A balancing machine, 7comprising an oscillatory member, asupport or attachment for a body to be tested carried by said member, balancing Weights also carried by lsaid 90. member, and means to revolve a body upon Lsaid support and said weights insynchro` nism, said Weights being simultaneouslyadjustable in'opposite directions circumferenti'ally of their axis of'rotation.

2. A balancingv machine, comprising an\ oscillatory member, a Lsupport or attachment for a body to be-tested carried by said memff rber, balancing weights also carried by said member, and means to revolve a body upon said support and said weights in synchro; nism, said weights being simultaneouslyl and uniformly adjustable in opposite directions circumferentially oftheir axis of. rotation vto createa centrifugal force in oppositionto a similar force caused by an vunbalanced con-V dition of the body being tested.

' 3. A balancing machine, comprising an oscillatory member,a support orattachment for a bodyto be tested carriedby said, mern- Y ber, balancing'weights also carried by said member, rand means to ,rvevyolve a body upon Isaid support and said" eights in synchro? nism, sald weightsy being adjustablel longitulinall and in opposite'dire'ctions circum- 11,5

ferentia l of their axis of rotation. f A 4. A balancing machine, comprising an oscillatory memberya support or attachment for a body to be tested carried by said mem-v ber, balancing weights 'also carried by said 12 member, and means to revolve va body upon said support and said Weights in lsynchronism, said, weights being simultaneously adjustable longitudinally, and in opposite directions circumferen ially, of theirgaxis 0h12 rotation, without a tering :their eective; angular relation with respect to a body upon said support.

5.,A balancing machine, comprising lan oscillatory member, a support or attachment mi t s1 f t.

for a body to be carried by member, balancing weights also carried by said member, and means'to revolve a body upoin said support andsaid weights in synchronism, said weights being simultaneously `adjustable circumferentially of their axis of i rotation, without altering their eifective L angular relation with respect toa body upon said support.

6. A. balancing machine, comprising an oscillatory member,` a support or attachment for a body to. be tested' carried by said v member, balancing weights also carried by said member, and means to revolve a body upon said support and said weight in synchromen, said weights -being mins-tatie simultaneously in opposite directions along .a spiral path extending abeuttheir axis'of rotation as ay center. l

7. AV balancin machine, comprising an oscillatory mem r,`a support -or attachment fora bodyto be tested carried by Said i oscillatorymember a sup rt or attachmentA d)o carried 'by said Jthe bodyl being tested in unison, a worm and worm- `and said gli:

a wormrlongitudinally of its axis of roy member, means also carried bfy said member and operative to create a vcentrifugal force `in opposition to-a similar'ferce caused by an. unbalanceddonditio/n Yof the body tested, meansto movesaidf first lmeans and the body being tested inunison, -a wrmgear connected to each support and said first means', a worm meshin with each of said gears, and means to shi t 'one of said worms' longitudinally to alter the angular relation an un s tested, means to move said first means w of one /of said'gears with respect to the other.

8. A'balancin machinefcomprisilrg an oscillatory mem er; a support o attachment for a body to be testedv carried by said member, means also, carried by said member 'operative to create a centrifugal force 1n opposition to a similar fdrce-causedJby the body being tested in unison, -a worm-gear connected to said first means, worm meshing with said ar, and `mealis to shift said worm longitu ally to alter the angular relation of said first means with respect to said support or attachment.-

9. A balancing machineycomprising an,

Ipi' a bodyto be teste member, means also carried by said member and operative to create a centrifugal force in opposition to a similar force caused by an unbalanced condition of the body being tasted, means to move said first means and chain between support tation to `alter ,the angularrelatio'n between means, and means tosshift said iirst means and said support or attachment. t

l0.' In a balancing' machine 'of the character described, the combination of a shaft,

means to rotate said shaft, a pair of equal test weights mounted? on said shaft, and means to adjust both o f. said weights simultaneously and erlluallytowardv and from one another angnlar about and during the rotation ofsaid s aft. A

11. A balancinggmachine, comprising"- al alaiced'condtion of the'body- JACOB "LUNDGRE testimonywhereof have aiixed my said weights simultaneously, to effect 

